Left compartment: Tetraodon barbatus (Thai puffer)
Center compartment: Tetraodon baileyi (Bailey's puffer), male.
Right compartment: Pair of Carinotetraodon salivator (Zebra/Striped red-eye puffers)
A Bristlenose catfish (Ancistrus sp.) is also kept in each compartment as an algae eater. None of the puffers has shown
any aggression towards these catfish.

Bailey's puffer

Thai Puffer

Zebra red-eye puffer,female

The removeable partitions in this tank are made from drilled plastic, so the whole tank shares one larger volume (which is therefore more stable),
but species can be kept separate to avoid any compatibility problems.
The external filter draws water from one side and returns it at the other, to make sure there is a flow of water through the partitions.